Passive Smoking and Lung Cancer Risk: What Is the Story Now?

Abstract
In this issue of the Journal, Boffetta et al. (1) report results from a large-scale multicenter epidemiologic investigation in Europe launched 10 years ago under the auspices of the International Agency for Research on Cancer (IARC) specifically to evaluate risks of lung cancer associated with exposure to environmental tobacco smoke (ETS). The results have been eagerly awaited because of the size of the study, the special attempts to minimize misclassification of cigarette smoking status, and the ability to control for various potential confounding factors.